Voltage regulating apparatus



March. 21, 1933. GROB 1,902,554

VOLTAGE REGULATING APPARATUS Filed Oct. 22, 1930 I INVENTOR BY (M'- V"ATTORNEY Patented Mar. 21,- 1933 NIT D STATES HUGO G303, r mm, cum!VOLTAGE QEGULATIHG APPARATUS a imation s mm as, 1m, aerm Io. 400.4, m inGermany emu: as, 1m.

The present invention relates to a frictionless joint for voltageregulating apparatus. 4

The operation of an automatic regulator 1 5 is, in the majority ofcases, based on the fact that certain oppositely acting forces possessedby the regulator mechanism aremaintained in a state of equilibriumforsuch time as the voltage to be regulated possesses the correct value,but are deprived vary their electrical resistance within wide limits. Incertain instances the variation in pressure is performed by a magnethaving a rotary armature, which exerts the necessary pressure by meansof an eccentri- 80 cally fitted stud.

Since for reasons of strength'the diameter of this stud may not be lessthan a certain amount, while if a knife-edge-bearing' is employed thesame must of necessity be furnished with a certain thickness in order toavoid all possible danger of. fracture or chipping, friction of adisturbing kind acf cordingly results uponthe rotary movement of thearmature, due to the considerable pressure which maybe exerted.

It is the primary object of the present invention to overcome thisdrawback, and this is accomplished by the use-of a joint or connection,in which, despite the strong force transmitted, friction toauyappreciable extent does not occur. The invention is accordingly based onthe idea of not enclosing therotary stud within a bearing of aproximately the same radius, but of allowing the same to roll over astrai t bearing which constitutesthe base 0 afork member formed bylateral abutments' Other objects and advantages of the invent'ion wil'tion proceeds. v V 'The invention will now be described more fully withreference to the accompanying drawing, which illustratesdiagrammatically a possible form of embodiment. K In the drawing Arepresents the column or pile of carbon discs constituting a variableelectric resistance, having at the top a rota counter-bearing B andsupported at the ttom by the fork-shaped pressure member C. The latterrests on the stud D of the magnet armature E, which is rotary about thebearing F. Bymeans of the spring G the pile or column, with theassistance of. the stud D, is subjected to compression with an anle-lever effect, but is again more or less reheved when the pull of theriagnet J exceeds the force of the spring i According now to theinvention, the bearing for the'goint D-C is not constructed in .the form0 the usual typeof bearing, but as a forked member having a flat bottomportion L, along which, when the armature rotates, the stud D is capableof rolling without friction. If the stud is incorrectly positioned inthefork, friction will only result upon the first movement of thearmature, due to the abutments Upon any subsequent rotation merely a.frictionless. rolling action will take place.

The armature bearing F is preferably constructed as a ball hearing. Theuse of a '5 ball bearing for the su portin point D will not, as ageneral rule, foun desirable for reasons of location or expense.

It will. be understood that no restriction is made to the specific formof embodiment shown, which is quoted merely by way of example, and thatvarious modifications are quite possible within the meaning of the aboveand the-annexed claims without departing from the spirit of theinvention; we

become apparent as the descrip- \Vhat I claim as new and desire tosecure by Letters Patent is:

1. In apparatus of the character described, in combination, a carbonpile, means pivotally supporting one end of said pile so that said pilemay pivot about the axis thereof and means at the other end of said pilehaving a substantially flat face extending transversely of the length ofsaid pile, said second-1ncntioned means with its flatface being adaptedto move in a direction to Vary the compression of said pile and to movewith the said other end of said pile as the latter swings about saidaxis, an elcctromagnet having and controlling a rotatable armature,spring means acting upon said armature to rotate it in a directionopposite to that in which an increasing flux of saidelectromagnetrotates said armature, and-a member carried by saidarmature at a point eccentric to the axis of rotation of said armature,said member having a curved face engaging said flat face and adapted tobe in rolling contact therewith as the flux of said magnet rotates saidarmature in one direction to swing said pile in one direction about theaxis of its pivot and said spring rotates the armature in oppositedirection to swing said pile in opposite direction about the axis of itspivot.

2. In apparatus of the character described, in combination, a carbonpile, means pivotally supportingone end of: said pile so that said pilemay pivot about the axis thereof and means at the other end of said pilehaving a substantially fiat face extending transversely of the length ofsaid pile, said secoml-mentioned means with its flat face being adaptedto move in a direction to vary the compression of said pile and to movewith the said other end of said pile as the latter swings about saidaxis, an electromagnet having and controlling a rotatable armat-ure,spring means acting upon said armature to rotate it in a directionopposite to that in which an increasing flux of said electromagnetrotates said armature. said armature having a curved portion rest.- ingagainst'said flat face and partaking of rollingconta'ct therewith assaid armature swings and thereby effecting swinging of said pile aboutthe axis of its pivot.

3. In apparatus of the character described, in combination, a carbonpile, means pivotally supporting one end of said pile so that said pilemay pivot about the axis thereof and means at the other end of said pilehaving a substantially flat face extending transversely of the length ofsaid pile, said FOC- ond-mentioned means with its'ilat fa'C'e beingadapted to move in a direction to vary the compression of said pile andto more with the said other end of said pile as the latter swingsabout'said axis; an eleetromagnet having and controlling a rotatablearmature, spring means acting upon said armature to rotate it in adirection opposite to that in which an increasing flux of saidelectromagnet rotates said armatu c, said arn'lature having a curvedportion positioned on that side of the axis of said armature that istoward said carbon pile and said in combination, a variable toggle madeup of two pivoted arms, one of which is in the form of a compressiblecarbon pile and the other of which is in the form of a lever arm, thefree ends of said carbon pile and said lever arm having parts fixedthereto and. shaped for rolling contact with each other whereby, as saidtoggle is flexed, the rolling contact of one of said partswith respectto the other shifts the effective point of pivotal connection betweenthe two arms of the toggle.

5. In apparatus of the character described, in combination, a carbonpile havingja rigid abutment at one end and provided" with a forkedmember at its other end, said forked member having a substantiallystraight-line portion intermediate the arms of the fork, and anelectromagnetically controlled member mounted to pivot about arelatively fixed axis and having a part extending between the arms ofsaid forked member and engaging said straight-line portion, said partbeing spaced from the axis of said secondmentioned member and having acurved face in direct engagement with said straight-line portion forrolling contact with the latter, said part with its curved face swingingwith said electromagnetically controlled member.

6. In apparatus of the character described, in combination, a carbonpile having a rigid abutment at one end and provided with a forkedmember at its other end, said forked member having a substantiallystraight-line portion intermediate the arms of the fork, a rotatablymounted armature, means including electro-responsive means forcontrolling the rotary movement of said armature, and a stud fixed tosaid. armature and spaced from the axis of the latter, said studengaging between the arms of said forked member and having a curved faceof relatively small radius directly engaging the straightline portion ofsaid forked member, whereby said stud and forked member are in rollingcontact as said armature swings about its axis. v i

7. In apparatus of the character described,

in combination, means forming two spaced and relatively fixed axes, acarbon pile, means pivoting one end of said carbon pile to one of saidaxes, a pressure-transmitting member at the other end of said carbonpile, and a member mounted to swing about the other of said two axes,said two members having portions engaging each other and shaped so thatone rolls upon the other as said second member is swung. I

In testimony whereof I have aflixed my signature.

HUGO GBOB.

